To me, starting an essay with a question is unbearably cliche for an experienced audiece, with few exceptions in my limited experience.
- If you are a good writer you can quickly address the question in an unconventional manner which deflects attention and provides you with an opening to move the reader along rapidly.
- Sometimes you can deliberately craft a scintillating conclusion which you think follows from some premises and work it into the question. At this point the onus is on you to prove it with a series of points that you try to relate to each other at critical junctures.
At some point, using questions to open as a literay device becomes obsolete when you can just as easily state your assertions forcefully to open, with the benefit of increased clarity and diminished awkwardness.
Here's a basic idea, even though you don't say what the topic is.
1. What are the most important qualities in a person that determine their success?
2. Is there any quality that can conceivably rival the importance of X in determining the relative success of a person.